Fig. 1

Histopathological classification of duodenal biopsies in 535 patients with positive serum tTG results. Box and whisker plot are generated using Microsoft Excel® and show the individual data (circles), as well as minimum value, first quartile, median, third quartile, maximum value, and outliers. Panel a shows all data, while panel b is limited to tTG results between 20 and 200 Chem’U. Three outliers labeled 1, 2 and 3 in the Indefinite Duodenitis group of Panel a are discussed in the body of the manuscript